Rules - Heads Up Rules

Bad Boy 8.5 Rules

(Ozark’s old Mean Street – adapted Midwest 8.5 Racers Association rules)

Published 12/3/12

Updated 4/26/13 - (change highlighted)

Please also read the ORP General Rules which apply to all races conducted at Ozark. For Non-ORP races, the sanctioning body rules of the track the event is being held at apply.

FORMAT

• This is an 1/8th mile heads-up class run on a .400 pro tree.
• Class is designed for rear wheel drive small block and big block vehicles with single stage plate systems, boosted small blocks and naturally aspirated small/big blocks.

SAFETY

• All NHRA/IHRA and local track safety rules apply for driver and car.
• Engine diaper or NHRA-accepted belly pan for oil containment required.

TIRES

• 26x8.5 slicks - May have Mickey Thompson (3052) or Hoosier (18115C11)

BODY

• The car must retain its original appearance, profiles, and dimensions.
• Factory roof and quarter panels must be used. Aftermarket fiberglass and/or carbon fiber replacement panels are limited to hood, front fenders(no one piece front ends), doors, deck-lids, and bumpers only.
• All front ends must be of factory dimensions and cannot be stretched.
• Aftermarket wings and spoilers are permitted.
• Complete stock appearing front and rear bumpers are required.
• A hood must be used.
• Forward facing hood scoops/turbo or supercharger inlets are permitted.
• Beam trippers, extenders prohibited. Must have working head lights and tail lights.
• Any charging system legal.

INTERIOR

• Factory appearing dash, door panels, and driver seat in stock location required. Carpet may be omitted for safety.
• Factory floor pan on driver and passenger side required.
• Must have factory transmission tunnel (no removable transmission tunnel) Aftermarket steering column permitted.

WINDSHIELD/WINDOWS

• OEM glass or lexan windows are permitted.

CHASSIS

• Complete stock chassis and frame rails must be retained from shock tower to behind the rear wheel opening.
• Back halved cars are not permitted. Front core support may be modified or removed.
• Aftermarket bolt-on replacement front K-members/sub frames are allowed. Front shocks must be in factory location.
• Factory wheelbase must be maintained.

EXHAUST

• Mufflers or inserts are required on all cars except for turbo cars.
• Exhaust may exit underneath car or out the front fenders but must not affect timing or staging beams.
• No Zoomies.

SUSPENSION

• Stock style, ladder bar or torque arm suspension cars only.
• Aftermarket four links are prohibited on all cars.
• Aftermarket replacement components such as; front control arms, rear control arms, front coil over shocks, and rear coil over shocks are permitted.
• Rear suspension may be moved to accommodate tire clearance and does not need to be mounted in stock location.
• Wheelie bars prohibited.

ELECTRONICS

• Any ignition or efi system on all combos. Boost controller legal. N2O controllers legal. No Davis traction control, BS3 Torque management, Fast Intelligent control or other similar products.
• Data logging allowed.

TRANSMISSION

• Any automatic or manual transmission allowed

FUEL

• Any race gasoline permitted. Alcohol only allowed with naturally aspirated motors. E85 legal for all combos. E98 only if non-intercooled.

WEIGHTS

• 4CYL 2150(n20 allowed on turbo)
• 6CYL 2800(single power adder only)
• SBNA 2550
• BBNA 3000
• SBN20 3000
• BBN20 3200
• SB BOOST 3200
• **Deduct 100 for factory valve angle heads (20*Ford, 23*Chevy, 15*LS, 18*Mopar) on (SBNA, BBNA, SBN20) ONLY

SMALL BLOCKS—N2O

• Any single carb or throttle body allowed.
• Aftermarket cast iron/aluminum blocks ok (no billet); any cast heads ok (no billet).
• No sheet metal intakes allowed, only cast, commercially available.
• Allowed any single stage production plate system including crossbar and diffuser style. Must have one fuel and one nitrous solenoid max on carb applications.
• EFI allowed 2 nozzles for N20. Foggers can be installed on car but must be capped before tech.
• May have an inline single solenoid purge which must exit above the hood.
• Single line only from N20 bottle to N20 solenoid which may consist of a -6an line with -6an fittings MAX from bottle and must have a single reduced line that's 12" MINIMUM of -4an line with -4an fittings MAX entering N20 solenoid. Nano or other pressure regulating systems are allowed. Only a single N20 bottle may be mounted.
  -4 line I.D. of .205 to .225 +/- .05
  -4 fitting I.D. of .153-155 +/- .05 ***A spec line can be purchased from MW8.5RA
• Nitrous controllers allowed.
• Small blocks with more than 440 ci will run under big block rules.
• All Buick, Oldsmobile, Pontiac, Cadillac, AMC will run under small block rules w/max 500ci.

BIG BLOCKS-N20:

• Any single carb or throttle body allowed.
• MAX deck height (10.2 Chevy, 10.3 Ford, 10.7 Mopar) 598 MAX CI and conventional heads only. Aftermarket cast iron/aluminum blocks ok (no billet). No tall decks
• No sheet metal intakes allowed, only cast, commercially available.
• Allowed any single stage production plate system including crossbar and diffuser style. Must have one fuel and one nitrous solenoid max on carb applications. EFI allowed 2 nozzles for
• N20. Foggers can be installed on car but must be capped before tech.
• May have an inline single solenoid purge which must exit above the hood.
• Single line only from N20 bottle to N20 solenoid which may consist of a -6an line with -6an fittings MAX from bottle and must have a single reduced line that's 12" MINIMUM of -4an line with -4an fittings MAX entering N20 solenoid. Nano or other pressure regulating systems are allowed. Only a single N20 bottle may be mounted.
  -4 line I.D. of .205 to .225 +/- .05
  -4 fitting I.D. of .153-155 +/- .05 ***A spec line can be purchased from MW8.5RA
• Nitrous controllers allowed.

BOOSTED (SMALL BLOCK ONLY) (No N20 any boosted combo except 4cyl)

• Aftermarket cast iron/aluminum blocks ok (no billet); any cast heads ok (no billet).
• Single carb or throttle body allowed.
• No sheet metal intakes allowed, only cast commercially available. Custom elbow ok
• Any race fuel or E85 (E98 non intercooled only, no alcohol).
• All blowers and turbos are to be UNMODIFIED (NO AFTERMARKET CHANGES, MUST BE FACTORY PRODUCED).

• #1 TURBOS mid frame 88mm MAX (mid frame Y2K or GT47-88 etc.) unmodified.
• No billet wheels, no large frame turbos or reducers.
• Any intercooler allowed.

BLOWERS F1C or equivalent MAX Unmodified.
• Gear drive/forward facing blowers legal.
• Any intercooler allowed.

• #2 TURBOS large frame 88mm MAX(X275 88mm etc), Twin 67's max Unmodified.
• Billet wheel legal, large frame legal, no reducers.
• Must be intercooled in front of firewall.
• Meth injection legal on air to air or non intercooled combos.

• BLOWERS F1R or equivalent MAX Unmodified.
• Must be intercooled in front of firewall.
• Gear drive/forward facing blowers legal.
• Meth injection legal on air to air or non intercooled combos.

SMALL BLOCK-NA

• Must be naturally aspirated.
• Aftermarket cast iron/aluminum blocks ok (no billet).
• No CI/Head limit.
• Sheet metal intakes allowed.
• Multiple carb/throttle body legal.
• Alcohol allowed.

BIG BLOCKS–NA

• Must be naturally aspirated.
• Any BB single carb or throttle body, aftermarket cast iron/aluminum blocks ok (no billet). (Max 10.2 deck Chevy, 10.3 Ford, 10.7 for Mopar). No tall decks
• 632 MAX CI.
• Any heads.
• No sheet metal intakes, only cast, commercially available.
• Alcohol allowed.